Ventilated fuse-plug.



F. C. CURTIS.

VENTILATED FUSE PLUG,

APPLIUATION FILED 11111.19. 1911.

Patented Sept. 19,-1911.

INVENTH WITNEEEJEE:

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FRANK C. CURTIS, TROY, NEW YORK.

VENTILATED FUSE-PLUG.

Specification of Letters Patent. `Patented Sept.' 19, 1911.

Application led January 19, 1911. Serial No. 603,433.

TovaZZ whom it mag/concern.'

Be it known that I, FRAXK C. CURTIS, a citizen of the United States, residing at Troy, county of Rensselaer, and State of New York, have invented certain new and useful Improvements in Ventilated Fuse-7 llugs, of which the following is a speciica tion. I The invention relates to such improvements and consists of the novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to theaccompanying drawings, and thereference characters marked thereon, which forma lpart. ofthis specification. Similar charactersy refer to similar parts in the several figures therein.

Figure l of the drawings isa View in crosssection taken through the axis of a fuseplug embodying my invention` Fig. Q is a horizontal cross-section taken on the broken line 2-2 in Fig. l. Fig. 3 is a section similar to Fig. v1, showing a portion of a fuseplug provided with another form of ventilating packing. Fig. 4 is a similar viewshowing still lanothery form of `Ventilating packing.

The principal object of the invention is to so ventilate a. fuse-plug that upon the distribution of the fuse the resultant gases under pressure will be permitted to escape from the plug by a large number of minute channels, whereby the escaping gases will 'be so subdivided and reduced in temperature that they issue from the plug in a safe condition.

Other `objects will appear in connection with the following description.

In carrying out my invention, I interpose between the cap andbody of the plug a ven tilating packing of incombustible material pervious to the passage of gases, affording a great number o minute channels for the escape of gases, whereby the body ofA gas is greatly subdivided in its escape from the lu p Rgeferring to the drawings wherein the invention isshown in preferred. form, v1represents the body of the plug made of insulating material, such as porcelain, having mounted thereon the exterior screw-shell. 2, and center contact, 3, connected together by the inclosed lfuse "The plug is closed by acap coniprising'a mica disk, '5, and a metal rim 6.

Asshown in Fig. l, I interpose between the cap and body of the plug a ventilating y packing, 9, formed of a woven wirefabric, which packing is preferably of angleform in cross-section, whereby it is formed with a peripheral fiange adapted to lie between t-he outer side of the body of the plug and the inc'losing flange, 10, of the cap-rim. The cap and packing are secured in position by inturning edge-portions of the ange, 10, 11, on the body of the plug. The ventilating packing is preferably made of the same extent as the Harige', 10, of the cap-rim, the outer edgeof the acking being bentunder the shoulder, ll, by the inturning of the edge of the cap-flange 10. As thus constructed gases generated within the plug are alorded numerous minute channels of escape above and beneath the wires of the packing, whereby the body of gas is 'broken up and so subdivided that its temperature is largely reduced by .the vtime it is permitted to escape along the'inturnededge of the capflange, 10; and, in the construction shown in Fig. l, the gases so escaping are directed inward against the smaller portion ofthe body of the plug, wherebytheir temperature is further reduced before they1 can come in contact with surrounding inflammable material. i

This invention is applicable to various types of fuse-plugs; and, -for certain purposes of the invention, the manner in which the plug is mounted in its socket, the manjner in which fuse is mounted in the plug, and the manner of attaching the cap are immaterial.

In Fig. 3. I have shown the Ventilating packing in the form of a washer. 1Q, formed of loosely arranged incombustible brous material such as asbestos, pervious to gases and adapted to finally subdivide a body of gas escaping from the plug undr pressure to accomplish the desired object. In Fig.`4, I have shown the Ventilating packing in the form of. a plurality of thin sheets of incombustible material, '14, such as sheet asbestos, which packing is pervious to the passage of gases between-said sheets, as well as between the bottom sheet and the body of the plug, and between the top sheet and the mica disk. l In the construction shown in Figs. 3 and 4, the cap-rim may be secured to thebody of the plug by introverting portions of the inthe exterior of the body shown at 13. v

lIn makingl the Ventilating packing of woven, wire fabric, as shown in Fig. 1, have found anwoven wire fabric such as is used for finely meshed window-screens, to produce a satisfactory result.

The mesh of the screen as well as the gage of the wire canbe Varied, however, to meet different conditions inuse; and, for certain purposes of the invention, a

of the plug, as

J' woven fabric of other incombustible materi'al than wire may be employed for Ventilating packing. v

What I claim as new and desire to secure by Letters latent is 1. In a Ventilated fuse-plug, and in combination with the body of the plug and a cap secured thereto, a Ventilating packing of incombustible material pervious to t-he the passage of gases interposed between saidbody and cap. l

2. In a Ventilated fuse-plug, and in combination with the body of the plug and a cap secured thereto, a Ventilating packin interposed between said cap and body, an having lnumerous minute channels for the escape of gases generated within the plug.

` 3. In a Ventilated fuse-plug, and in combination with the body of the plug and a cap secured thereto, a Ventilating packing formed of woven wire interposed between saidcap and body. f

4. In aventilated fuse-plug,l and' in combination with the body of the plug, and a cap having a peripheral flange inclosing `the body of the plug and secured thereto, a Ven- `tween said cap and body, and havlng a peripheral vflange interposed between vthe shouldered port-ion of the body and the peripheral fiange of the cap, and inturnedv along its edge betweensaid shoulder and theJ intluned edge of the cap-fiange.

In testimony whereof, Iy have lhereunto set my hand this 16th day of January, 1911.

FRANK C. CURTIS. -Witnesses i ROSE A. LEDUC, J. E. DoNsAoH. 

